10066100661565 has 16 divisors (see below), whose sum is σ = 13010572250928. Its totient is φ = 7432243646976.

The previous prime is 10066100661541. The next prime is 10066100661587. The reversal of 10066100661565 is 56516600166001.

It can be written as a sum of positive squares in 8 ways, for example, as 312334559161 + 9753766102404 = 558869^2 + 3123102^2 .

It is a cyclic number.

It is not a de Polignac number, because 10066100661565 - 2³¹ = 10063953177917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11927752 + ... + 12743761.

It is an arithmetic number, because the mean of its divisors is an integer number (813160765683).

Almost surely, 2^{10066100661565} is an apocalyptic number.

It is an amenable number.

10066100661565 is a deficient number, since it is larger than the sum of its proper divisors (2944471589363).

10066100661565 is a wasteful number, since it uses less digits than its factorization.

10066100661565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24677808.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 10066100661565 in words is "ten trillion, sixty-six billion, one hundred million, six hundred sixty-one thousand, five hundred sixty-five".